diff --git a/src/main.c b/src/main.c
index 0f85dca21..108bde0a8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -132,7 +132,7 @@ static bool parse_args(int argc, char **args)
                                strlen(prog_basename) + 5 + 1);
         assert(prof_out_file);
 
-        sprintf(prof_out_file, "%s/%s%s.prof", cwd_path, rel_path,
+        snprintf(prof_out_file, sizeof(prof_out_file), "%s/%s%s.prof", cwd_path, rel_path,
                 prog_basename);
     }
     return true;